Constraints on the time variation of the fine structure constant by the 5-year WMAP data

Details Constraints on the time variation of the fine structure constant by the 5-year WMAP data Constraints on the time variation of the fine structure constant by the 5-year WMAP data

2008-10-07

arxiv.org/abs/0810.1098v2

Prog. Theor. Phys. 120 (2008), 1207

Astronomy and Astrophysics

Astrophysics

11 pages, 5 figures; references added

Scientific paper

10.1143/PTP.120.1207

The constraints on the time variation of the fine structure constant at recombination epoch relative to its present value, $\Delta\alpha/\alpha \equiv (\alpha_{\mathrm{rec}} - \alpha_{\mathrm{now}})/\alpha_{\mathrm{now}}$, are obtained from the analysis of the 5-year WMAP cosmic microwave background data. As a result of Markov-Chain Monte-Carlo analysis, it is found that, contrary to the analysis based on the previous WMAP data, the mean value of $\Delta\alpha/\alpha=-0.0009$ does not change significantly whether we use the Hubble Space Telescope (HST) measurement of the Hubble parameter as a prior or not. The resultant 95% confidence ranges of $\Delta\alpha/\alpha$ are $-0.028 < \Delta\alpha/\alpha < 0.026$ with HST prior and $-0.050 < \Delta\alpha/\alpha < 0.042$ without HST prior.

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